Analytical Evaluation of Nonlinear Effects on OFDMA Signals
Autor(a) principal: | |
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Data de Publicação: | 2010 |
Outros Autores: | |
Tipo de documento: | Artigo |
Idioma: | eng |
Título da fonte: | Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) |
Texto Completo: | http://hdl.handle.net/11144/3716 |
Resumo: | As with other multicarrier modulations, OFDMA signals (Orthogonal Frequency Division Multiple Access) have large envelope fluctuations making them very prone to nonlinear distortion effects. In this paper we study the impact of nonlinear devices on OFDMA signals. We present an analytical characterization of the signals at the output of a nonlinear device that can be used for obtaining the spectral characterization of the transmitted signals, as well as the computation of the nonlinear interference levels on the received signals. It is shown that the power allocated to each user has a key impact on the nonlinear distortion effects. For this reason, we should avoid having low-power and high-power users in adjacent subcarriers. It is also shown that nonlinear distortion levels are lower when just a small fraction of the subcarriers is used (i.e., when the system load is small). |
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Analytical Evaluation of Nonlinear Effects on OFDMA SignalsOFDM signalsNonlinear effectsIntermodulation analysisWireless accessOFDMAAs with other multicarrier modulations, OFDMA signals (Orthogonal Frequency Division Multiple Access) have large envelope fluctuations making them very prone to nonlinear distortion effects. In this paper we study the impact of nonlinear devices on OFDMA signals. We present an analytical characterization of the signals at the output of a nonlinear device that can be used for obtaining the spectral characterization of the transmitted signals, as well as the computation of the nonlinear interference levels on the received signals. It is shown that the power allocated to each user has a key impact on the nonlinear distortion effects. For this reason, we should avoid having low-power and high-power users in adjacent subcarriers. It is also shown that nonlinear distortion levels are lower when just a small fraction of the subcarriers is used (i.e., when the system load is small).IEEE2018-04-13T12:25:46Z2010-11-01T00:00:00Z2010-11info:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/articleapplication/pdfhttp://hdl.handle.net/11144/3716eng1536-127610.1109/TWC.2010.081810.091662Araújo, TeresaDinis, Ruiinfo:eu-repo/semantics/openAccessreponame:Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos)instname:Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informaçãoinstacron:RCAAP2024-01-11T02:27:22Zoai:repositorio.ual.pt:11144/3716Portal AgregadorONGhttps://www.rcaap.pt/oai/openaireopendoar:71602024-03-20T01:35:35.264354Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) - Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informaçãofalse |
dc.title.none.fl_str_mv |
Analytical Evaluation of Nonlinear Effects on OFDMA Signals |
title |
Analytical Evaluation of Nonlinear Effects on OFDMA Signals |
spellingShingle |
Analytical Evaluation of Nonlinear Effects on OFDMA Signals Araújo, Teresa OFDM signals Nonlinear effects Intermodulation analysis Wireless access OFDMA |
title_short |
Analytical Evaluation of Nonlinear Effects on OFDMA Signals |
title_full |
Analytical Evaluation of Nonlinear Effects on OFDMA Signals |
title_fullStr |
Analytical Evaluation of Nonlinear Effects on OFDMA Signals |
title_full_unstemmed |
Analytical Evaluation of Nonlinear Effects on OFDMA Signals |
title_sort |
Analytical Evaluation of Nonlinear Effects on OFDMA Signals |
author |
Araújo, Teresa |
author_facet |
Araújo, Teresa Dinis, Rui |
author_role |
author |
author2 |
Dinis, Rui |
author2_role |
author |
dc.contributor.author.fl_str_mv |
Araújo, Teresa Dinis, Rui |
dc.subject.por.fl_str_mv |
OFDM signals Nonlinear effects Intermodulation analysis Wireless access OFDMA |
topic |
OFDM signals Nonlinear effects Intermodulation analysis Wireless access OFDMA |
description |
As with other multicarrier modulations, OFDMA signals (Orthogonal Frequency Division Multiple Access) have large envelope fluctuations making them very prone to nonlinear distortion effects. In this paper we study the impact of nonlinear devices on OFDMA signals. We present an analytical characterization of the signals at the output of a nonlinear device that can be used for obtaining the spectral characterization of the transmitted signals, as well as the computation of the nonlinear interference levels on the received signals. It is shown that the power allocated to each user has a key impact on the nonlinear distortion effects. For this reason, we should avoid having low-power and high-power users in adjacent subcarriers. It is also shown that nonlinear distortion levels are lower when just a small fraction of the subcarriers is used (i.e., when the system load is small). |
publishDate |
2010 |
dc.date.none.fl_str_mv |
2010-11-01T00:00:00Z 2010-11 2018-04-13T12:25:46Z |
dc.type.status.fl_str_mv |
info:eu-repo/semantics/publishedVersion |
dc.type.driver.fl_str_mv |
info:eu-repo/semantics/article |
format |
article |
status_str |
publishedVersion |
dc.identifier.uri.fl_str_mv |
http://hdl.handle.net/11144/3716 |
url |
http://hdl.handle.net/11144/3716 |
dc.language.iso.fl_str_mv |
eng |
language |
eng |
dc.relation.none.fl_str_mv |
1536-1276 10.1109/TWC.2010.081810.091662 |
dc.rights.driver.fl_str_mv |
info:eu-repo/semantics/openAccess |
eu_rights_str_mv |
openAccess |
dc.format.none.fl_str_mv |
application/pdf |
dc.publisher.none.fl_str_mv |
IEEE |
publisher.none.fl_str_mv |
IEEE |
dc.source.none.fl_str_mv |
reponame:Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) instname:Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informação instacron:RCAAP |
instname_str |
Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informação |
instacron_str |
RCAAP |
institution |
RCAAP |
reponame_str |
Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) |
collection |
Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) |
repository.name.fl_str_mv |
Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) - Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informação |
repository.mail.fl_str_mv |
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1799136831816597504 |